FancyZones: Not working with Application Guard

[jopose]

Environment

Windows build number: 1903 18362.10024
PowerToys version: 0.12.0.0
MS Edge version: 44.18362.10024.0
MS Edge(Chromium) version: 79.0.309.5 (Official build) dev (64-bit)

PowerToy module for which you are reporting the bug (if applicable):

FanzyZones

Steps to reproduce

Start Edge in Application guard(regular edge or edge chromium).
Try to Shift-drag

Expected behavior

Zones should show and the window should snap to zone.

Actual behavior

No zones is showing when trying to Shift-dragged.

[enricogior]

@jopose
thank you!

[bzoz]

So, it turns out those Application Guard windows are weird. First, they do not send EVENT_SYSTEM_MOVESTART nor EVENT_SYSTEM_MOVEEND messages. We depend on them to detect if a window is dragged by mouse. It sends other messages though.

And secondly - if moved with WinKey + arrow key, they bug out, and instead of being moved they end up cropped (note the right side of the window, the minimize/maximize button is missing):

While we might have some luck with moving the window in some other way to prevent cropping, there is little we can do if the window does not sends mouse move events.

[jopose]

@bzoz: WinKey + Arrow works for me.(Normal windows behaviour, that is. No FanzyZones)
Windows build number: 1903 18362.10024, Swedish.

[bzoz]

There is a setting for overriding the Windows snap button, make sure it is enabled.

[jopose]

@bzoz: Ah, ok then the window gets cropped. But the window moves between the diffrent zones cropped.

[enricogior]

@crutkas
I don't think this is fixable.
Each Application Guard window is hosted in the hvsirdpclient.exe process.
We don't receive any system notification from individual Application Guard Edge windows.
Also using Win+arrow, to snap those windows, result not only if cropped windows, but also in unresponsive windows.
Btw, Windows 10 Snap shows a very different rendering when snapping regular Edge windows vs Application Guard Edge windows, suggesting something custom is going on for Application Guard windows.

[crutkas]

Lets revisit later then based on this investigation.

Idea is to treat app guard windows like we do when we aren't elevated and there is an elevated window. "hey, this is an application that we can't interact with due to ..."

[enricogior]

Tracking this issue in #6193 #1466

[enricogior]

Nothing that we can do about it. When an app runs in Application Guards, FancyZones doesn't have access to keyboard/mouse events.
Added to https://github.com/microsoft/PowerToys/wiki/Application-Compatibility